Nordost Frey interconnect hum


I bought a pair of used Nordost Frey unbalanced interconnects here and i noticed they induce a hum through my speakers when my preamp is off or when the cables are only plugged into the power amp. The strange thing to me is that my Nordost Heimdall interconnects do not induce the hum under the same conditions nor do other shielded interconnects. They do the same thing on another system as well. I understand that both the Heimdall and Frey have the same 97% shielding and the only difference is 2 extra center conductors. I'm waiting for the seller to ask Nordost but i thought i would ask here if anyone can explain it.

Thanks for any advice.
pongagt
Bo1972, I used to own Highwire cables which replaced Audioquest cables. The Nordost are FAR more resolving than either cable. Not sure what your your system consists of, BUT in my system, the differences are easy to hear. The Nordost cables are far superior.
If you think that Valhalla has less stage depth than the Redwood Audioquests, well like I said before, YMMV.
When I was looking at cables I had the demo case that consisted of bh through freys. In my system the bh and rd were too bright for me. The baldur was dull sounding and not as bright. The heimall and frey were extremely close but with those cables I could really hear the 'air' between the instruments and vocals. To me and my system the latter had the most balanced sound. I bought the frey ic and sc. Still have the sc but have since upgraded the ic to the tyr2. The series2 have a more liquid sound and more low end yet still sound very balanced. The new series2 are very different and in my opinion much better.
Xti16, I too have the Frey sc's and am also using Tyr ic's. I think this is a great combo.
Daveyf - Have you had a chance to demo the new series2? I was quite happy with all original Frey's. Then I heard the series2. All I can say is Wow.
Xti16, I have heard the Frey 2 ic's but not the speaker cables. I think the Tyr ic's are still superior to the Frey 2 ic's. Happy with my Frey sc's...for now:0)